Lubricating fitting



May s, 1934. G, s, ROGERS 1,957,731

LUBRICATING FITTING Filed May 7, 1952 J7 a i fi@ Patented May 8, i934 icm Lea'rmc :y ceram s. negers, Pittsburgh, ra. Appiieauoii may 7, 1932, serial No. 609,843

1 claim. (ci. isi-105) f My invention relates to a fitting or receptacle adapted to be incorporated in machines or other devices at points requiring lubrication.

A number of such devices have been known y heretofore but have been found unsatisfactory in certain respects. A device of this character must have a duid-tight closure to prevent leakage of lubricant supplied thereto. One of the previous flttingsof this type includes a pin ex- 0 tending transversely through a tubular barrel, a spring seated on the pin and engaging a ball closure for urging it towards its seat. The spring is supported only at two points, namely, the lpoints of tangency of the lower turn of the spring with the pin. The pin also cooperates externally of the fitting with bayonet slots in a coupling con- Y nected to a lubricant dispenser. Since the spring is supported only at two spaced points, the result is that the other portions of the spring sag aroimd the pin and may even slide oi altogether. In this case, the effect of the spring in forcing the closure home to its seat is greatly weakened. Since the closure does not seat with the necessary force, leakage from the fitting is the result.

I have invented a lubricating tting in which a ball closure is moved toward its seat by a spiral spring. A sleeve inserted in the itting barrel provides support for the lower turn of the spring throughout substantially the entire circumference of the latter. Instead of using a single transverse pin, I prefer to employ separate lugs inserted into the barrel at diametricallyopposite pointsthereof. 'Ihe spring-supporting sleeve is slotted to receive -the ends of the lugs in case they project inwardly of the barrel. In a modified form of the invention, the lugs for engaging the coupling are integral with the barrel instead of inserted therein. For a complete understanding of the invention,

reference is made to the accompanying drawing,

in which:

Figure 1 is an axial sectional view through a fitting embodying the invention;

Figure 2 is a similar view of a modified form; Figure 3 is an end view-of the device of Figure 1 'looking from the left-hand emi or the meer;

Figure4isanendviewqftheotherendofthe tting;

Figure 5 is a transverse sectionalview taken i along the plane of line V-V of Figure 1; and

Figure Gis a side elevation of the sleeve. Y

Referring in detail to the drawing, the invention comprises a tubular barrel 10, one end of which is threaded as at 11 whereby the tting maybe screwed into machine parts adjacent pori Y:S5 tim-inermi requiring lubrieauon. a una:

the lug 16, the closure 21 is forced from its wrench-receiving portion 12 is formed integral with the barrel. A longitudinal bore 13 extends through Athe barrel but tapers to a hole 14 of smaller diameter in the unthreaded end 15 of the barrel.

Lugs 16 are inserted into the barrel at diametricallyr opposite points thereof A sleeve 17 having slots 18 and projecting ends 19 is pressed into the bore 13 so as to have a tight frictional nt therein.

A spiral spring 20 is seated on the projecting ends 19 of the sleeve 17. A ball closure 21 is seated in a tapered portion of the bore 13. The spring 20 normally Vforces the closure firmly against its seat. 1 7

When a suitable-coupler, such as that shown, described and claimed in my co-pending application, Serial No. 609,844, filed May 7, 1932, for Coupling, is attached to the tting by means of seat to open a path into the interior of the sleeve 17 for the lubricant which is forced therein under pressure. When the pressure is released, the spring 20 immediately reseats the closure 21 with a considerable force so that leakage from the end of the barrel is impossible. Since the spring 20 is firmly supported by the projections 19 on the sleeve 17 throughout substantially the entire portion of its circumference, except for the width of the slots 18, the spring exerts a much greater force on the closure than would be exerted by the spring if it were supported only at two points of tangency with a pin extending transversely through the barrel;

A modified form of the invention illustrated inFigure2isquitesimilarto thatofFigure 1 except that a barrel 25 has lugs 26 formed integral therewith. A sleeve 27 forced into the bore of the barrel supports a spring 28 throughout its entire circumference for forcing the ball closure 29 toward its seat. Since the lugs 26 do not project inside thebarrel 2,5, the sleeve 27 need not be slotted and thus provides additional supporting surface for the lower coil of the spring 28. i

By the term lower coil used' herein I intend to refer to the turn ofthe spiral spring which engages the supporting sleeve.

It will be apparent from the foregoing that i the invention described herein is improvement ,upon similar devices known heretofore in that the closure is seated more tightly because of the much greater supporting area provided for the closingspring. In tests, the invention has demonstrated its capability of as arr." Y

. it may vbe embodied in other forms than those shown Without departing from the spirit of the appended claim or sacrificing any of the advantages mentioned.

I claim:

In a lubricating tting, the combination with an integral tubular barrel having an axial bore,

a closure seat at one end of said bore, the other end of the barrel being externally threaded, a closure on said seat, and a spring for seating the'closure, of a pin projecting through the wall of the barrel at one point at least, and a sleeve inserted in said barrel, said sleeve engaging said spring to cause seating of the closure, said sleeve y,being notched to clear said pin.

GERALD -S. ROGERS. 

